The workers have a right to organize a labor union. They have a right to go on strike and shut the company down. They have a right to critique any process or rule in the company that they might wish to stop. They have a right to weigh in on the consequences of any of the company's processes, goals, or aims. The workers have had these rights recognized in law for most of the last century.
Your first two “rights” (form a union, and if they do, to organize a strike) are in fact legally protected behavior in the US. Latter two are just made-up nonsense. No, they in fact do not have those “rights”, you just wish they did.
We are not talking about internal company problems here. We are talking about letter about behaviour of the boss outside of the company which is of no concern of employees.
